Dear Soroor,
yes, setting
matlabbatch{1}.spm.util.voi.adjust = 0; % Effects of interest contrast number
should disable adjustment.
Did you estimate your model prior to timeseries extraction? Even without adjustment, SPM will still whiten and filter your data. When you adjust for everything, SPM will remove any effects modelled in your design from your data. Obviously, this will only work for estimated models.
Hope this helps,
Volkmar
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